Zeb Montague Kyffin (born 23 February 1998) is a British cyclist who currently rides for .
In 2017 Kyffin finished in the top ten during the 2017 British National Hill Climb Championships.
In 2018 Kyffin joined the British road racing team , finishing twelfth in the under-23 element of the British National Road Race Championships.
In 2019 he participated in the Tour de Yorkshire, the British National Road Race Championships, and the British National Time Trial Championships; he also competed in the Saudi Tour in 2020.
In 2021 after the gradual alleviation of COVID-19 restrictions in the United Kingdom, Kyffin won the Chitterne Road Race - thus, becoming the first UCI continental rider to win a British national road race since 2019.
In 2024, Kyffin joined UCI ProTeam . With Unibet, he won his first professional race, in Stage 7 of 2025 Tour de Langkawi.
Kyffin's contract with were not renewed at the end of 2025. Subsequently he joined UCI Continental Team .
Kyffin lived in Eindhoven, the Netherlands, until he was twelve years old. He then moved to Newcastle upon Tyne and was educated at Newcastle School for Boys.